You could also make the racks into locking racks, then have the lock on the door. Not because I think they're necasary, but to soothe their minds about the snakes staying locked up.
You could also do something really dumb like put a piece of rope across the threshold of the snake room door, and tell them the old wive's tale about snakes not crossing ropes. It's not true, but whatever makes them feel better.
And it's true, the family dog kills more people in a single year than have been killed by ALL pythons in the US in 30 years. So baby is safe.